It really depends on what you're looking for: Lifestyle (young and active/ older and elegant?), affordability, family friendliness, length of cruise (3 nights/ 7 night/ 10 or more nights?), ports of call...
I found the following ships sailing from Port Canaveral:
Carnival Glory (7 day)
Carnival Pride (7 day)
Carnival Fantasy (3/4 day)
Disney Wonder (3/4 day)
Disney Magic (7 day)
Norwegian Dawn (7 day)
Holland America Zaandam (7 day)
Royal Caribbean Mariner of the Seas (7 day)
Royal Caribbean Sovereign of the Seas (3 day)
Fort Lauderdale (Port Everglades) and Miami are more active ports, and will have lots more selection.
There are a number of cruise specific sites on the net where you can read cruise reviews, and ratings of everything from quality of food to entertainment to shore excursions to housekeeping onboard... you might try Cruise Critics, Cruise@ddicts, CruiseMates.
For pricing, try Travelocity.com, YahooTravel.com, Cruise.com, vacationstogo.com, cruisequick.com, the specific cruise line websites...
The folks on the DIS's
Disney Cruise Line Forum would probably be lots of help, too.